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The period of cos(x+2x+3x+.....+nx) is...

The period of ` cos(x+2x+3x+.....+nx)` is

A

`4pi//n(n+1)`

B

`4pi//(n+1)`

C

`4pi//(n-1)`

D

none

Text Solution

Verified by Experts

The correct Answer is:
A
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